A semi-tone on a piano is the distance from a white key to the next black key on the keyboard
Schoenberg's technique in composition is the use of the semi-tone scale, The correct option is d. Schoenberg
The reason the option d is correct is as follows:
In a 12-note scale, the semitone is defined the distance between two adjacent notes and it is the smallest interval or pitch difference used frequently that can be found in western music organized in tones.
The semitone is made use of in the compositions of Arnold Schoenberg, as a tonal harmony extension. The 12-tonne technique, developed by Schoenberg considers the chromatic scale's 12 semitones as being of equal importance and normally the twelve tone music is atonal
The correct option is therefore, Schoenberg
Learn more about the semi-tone scale here:
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